I am trying to calculate the spontaneous emission (SE) from a dipole placed close to a structure. From the Lumerical website’s tutorials, it says that the SE enhancement is simply calculated by:
SE enhancement = dipolepower()/sourcepower();
However, the answer I am getting is quite different from what I get based on my own Green’s function calculations using the exported electric field and dipole power data from the FDTD simulation.
Do you know how dipolepower() and sourcepower() are formulated in FDTD?